Now you can move, tilt, and zoom the camera to make some more interesting patterns:
Note the camera control icons in these stills. I don't have a video camcorder, so I tried to use the video mode of a point and shoot digital camera. In fact, I tried 2 different cameras, and found that I couldn't get rid of all the icons on either of them. My current budget is constrained enough that I can't afford to go out and buy a camcorder just now, so simple video feedback is problematic for this project.
Never fear, the computer will save me. Turns out it's not at all difficult to simulate video feedback with a program. On Mac OS X, there is a program called Quartz Composer that allows you to program complicated video effects in the Core Image API. You can build components (called "patches") for these programs using standard Mac Objective-C coding, but once they're built, you can wire them together with composer in a visual editor paradigm. Since the system comes supplied with a wide-range of patches, and there are more at various developer sites on the web, you can do a lot without ever writing any code. I made some simple feedback videos using input from the iSight camera in my laptop feeding into Quartz Composer; here's one still:
Here's a screen-shot of a composer editor window:
That window shows the wiring diagram for a feedback video that looks like this:
And here's a short video of another simulated feedback program: